| 摘要 |
PURPOSE:To realize a compact structure and a large number of magnifications, by installing a driven member in parallel to an optical path and operating it with a pin member provided to a projection lens. CONSTITUTION:A lens 7 is mounted on a lens base 30 and movable by a wire 35 in directions X and Y along the optical path P. Both ends of the wire 35 are fixed to the lens base 3 through springs 36 and 36 and its intermediate part is wound around a drum 38 fitted to the power shaft of a lens motor M2 through a pulley 37; and the wire 35 is driven clockwise by the normal rotation of a lens motor M2 to move the lens 7 as shown by an arrow Y. On the other hand, the wire is driven counterclockwise through the reverse rotation to move the lens 7 as shown by the arrow X, and the springs 37 and 37 absorb the inertia of the motor M2. In this example, four kinds of copy magnification are set and the lens 7, therefor, has four set stop positions. |
